EASY
8th CBSE
IMPORTANT
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On subtracting a3+b3+c3-3abc from 7abc-3a3+5b3-c3 we get -4a3+4b3-2c3+kabc, find the value of k

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Important Questions on Algebraic Expressions and Identities

EASY
8th CBSE
IMPORTANT

If we subtract 3x-7x3+5x2 from the sum of 2+8x2-x3 and 2x3-3x2+x-2.

We get ax3+bx then find the value of a+b.

EASY
8th CBSE
IMPORTANT

If we simplify the following expression we get a2+ka, then find the value of k.

4a-2a2-2a-3a2

MEDIUM
8th CBSE
IMPORTANT

Simplify the following.

3x-4y-3y+x-5x-8y

 

MEDIUM
8th CBSE
IMPORTANT
 If ka2b-14ab2+a3b3+b4 is added to 10a2b+8ab2-8a3b3-b4 to get 5a2b-6ab2-7a3b3, then find the value of k.
EASY
8th CBSE
IMPORTANT
If 3x3+kx2y-10xy2+y3-y is subtracted from 8x3+7x2y-3xy2-y to get 7xy2-y3-3x2y+5x3 then find the value of k.
MEDIUM
8th CBSE
IMPORTANT
Find the perimeter of a rectangle whose adjacent sides are 3x-5y-4z and x-3y+5z
EASY
8th CBSE
IMPORTANT
The perimeter of a triangle is 5x2+3x-1 and two of it's sides are 2x-5+7x2 and 3x2+4-2x3+x. If the third side of the triangle is ax3+bx2, then find the value of a+b.
MEDIUM
8th CBSE
IMPORTANT
A boy works x+y sums of which only y-2z are right. How many are wrong?